You can also google the cemetery to see if it is still an actively-used cemetery to get further information. Cities/towns often maintain their own cemetery (like where I live: Mountain View Cemetery in Shrewsbury, Massachusetts) and will provide location information, etc. Churches also often have associated cemeteries and have information.
Bear in mind that the cemetery pages on Find A Grave were also created by volunteers and can contain errors. There are also duplicated cemeteries. The admin tries to stay on top of it, but some cemetery corrections I have submitted in the past took months to be implemented, then a new user duplicated the cemetery YET AGAIN.
I applaud your efforts to get things right, Gilbert.